/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.starapp.plugins.shiro.realm;

import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;

import org.apache.shiro.authc.AccountException;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.Permission;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.apache.shiro.util.CollectionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.starapp.core.utils.Encodes;
import org.starapp.rbac.contants.AppContants;
import org.starapp.rbac.entity.Roles;
import org.starapp.rbac.entity.Users;
import org.starapp.rbac.service.UsersService;

public class ShiroDbRealm extends AuthorizingRealm {

	private UsersService usersService;

	@Autowired
	public void setUsersService(UsersService usersService) {
		this.usersService = usersService;
	}

	protected AuthorizationInfo doGetAuthorizationInfo(
			PrincipalCollection principals) {
		
		if (principals == null) {
            throw new AuthorizationException("Principal对象不能为空");
        }

		// 获取当前登录的用户名
        Users user = (Users) principals.fromRealm(getName()).iterator().next();
        
        // 获取当前登录的用户名
		//Users u = (Users) super.getAvailablePrincipal(principals);

        //获取用户响应的permission
        List<String> permissions =null;//(user.getObjectsList());

        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        
        // 给当前用户设置角色
		//info.addRoles(null);
        info.addRole(user.getRolesM2MList().iterator().next().getRoleId());

		// 给当前用户设置权限
        //info.addStringPermissions(permissions);

        return info;
	}

	/**
	 * 认证回调函数,登录时调用.
	 */
	protected AuthenticationInfo doGetAuthenticationInfo(
			AuthenticationToken token) throws AuthenticationException {

		UsernamePasswordToken usernamePasswordToken = (UsernamePasswordToken) token;

        String username = usernamePasswordToken.getUsername();

        if (username == null) {
            throw new AccountException("用户名不能为空");
        }

        Users user = usersService.getUsers(username);

        if (user == null) {
            throw new UnknownAccountException("用户不存在");
        }
        byte[] salt = Encodes.decodeHex(user.getSalt());
        
		return new SimpleAuthenticationInfo(user,
				user.getPassword(), ByteSource.Util.bytes(salt), getName());

	}

	/**
	 * 设定Password校验的Hash算法与迭代次数.
	 */
	@PostConstruct
	public void initCredentialsMatcher() {
		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(
				AppContants.HASH_ALGORITHM);
		matcher.setHashIterations(AppContants.HASH_INTERATIONS);
		setCredentialsMatcher(matcher);
	}
}
